Field device



FIG. 1 is a front elevational view of the field device showing my new design;

FIG. 2 is a rear elevation view of the field device;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right top perspective view thereof.

The broken line showing of the field device is for illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a field device, as shown and described. 